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1/*
2 * Copyright (c) 2016 Intel Corporation
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23#include <linux/export.h>
24#include <drm/drmP.h>
25#include <drm/drm_mode_object.h>
26#include <drm/drm_atomic.h>
27
28#include "drm_crtc_internal.h"
29
30/*
31 * Internal function to assign a slot in the object idr and optionally
32 * register the object into the idr.
33 */
34int __drm_mode_object_add(struct drm_device *dev, struct drm_mode_object *obj,
35 uint32_t obj_type, bool register_obj,
36 void (*obj_free_cb)(struct kref *kref))
37{
38 int ret;
39
40 mutex_lock(&dev->mode_config.idr_mutex);
41 ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL);
42 if (ret >= 0) {
43 /*
44 * Set up the object linking under the protection of the idr
45 * lock so that other users can't see inconsistent state.
46 */
47 obj->id = ret;
48 obj->type = obj_type;
49 if (obj_free_cb) {
50 obj->free_cb = obj_free_cb;
51 kref_init(&obj->refcount);
52 }
53 }
54 mutex_unlock(&dev->mode_config.idr_mutex);
55
56 return ret < 0 ? ret : 0;
57}
58
59/**
60 * drm_mode_object_add - allocate a new modeset identifier
61 * @dev: DRM device
62 * @obj: object pointer, used to generate unique ID
63 * @obj_type: object type
64 *
65 * Create a unique identifier based on @ptr in @dev's identifier space. Used
66 * for tracking modes, CRTCs and connectors.
67 *
68 * Returns:
69 * Zero on success, error code on failure.
70 */
71int drm_mode_object_add(struct drm_device *dev,
72 struct drm_mode_object *obj, uint32_t obj_type)
73{
74 return __drm_mode_object_add(dev, obj, obj_type, true, NULL);
75}
76
77void drm_mode_object_register(struct drm_device *dev,
78 struct drm_mode_object *obj)
79{
80 mutex_lock(&dev->mode_config.idr_mutex);
81 idr_replace(&dev->mode_config.crtc_idr, obj, obj->id);
82 mutex_unlock(&dev->mode_config.idr_mutex);
83}
84
85/**
86 * drm_mode_object_unregister - free a modeset identifer
87 * @dev: DRM device
88 * @object: object to free
89 *
90 * Free @id from @dev's unique identifier pool.
91 * This function can be called multiple times, and guards against
92 * multiple removals.
93 * These modeset identifiers are _not_ reference counted. Hence don't use this
94 * for reference counted modeset objects like framebuffers.
95 */
96void drm_mode_object_unregister(struct drm_device *dev,
97 struct drm_mode_object *object)
98{
99 mutex_lock(&dev->mode_config.idr_mutex);
100 if (object->id) {
101 idr_remove(&dev->mode_config.crtc_idr, object->id);
102 object->id = 0;
103 }
104 mutex_unlock(&dev->mode_config.idr_mutex);
105}
106
107/**
108 * drm_lease_required - check types which must be leased to be used
109 * @type: type of object
110 *
111 * Returns whether the provided type of drm_mode_object must
112 * be owned or leased to be used by a process.
113 */
114bool drm_mode_object_lease_required(uint32_t type)
115{
116 switch(type) {
117 case DRM_MODE_OBJECT_CRTC:
118 case DRM_MODE_OBJECT_CONNECTOR:
119 case DRM_MODE_OBJECT_PLANE:
120 return true;
121 default:
122 return false;
123 }
124}
125
126struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
127 struct drm_file *file_priv,
128 uint32_t id, uint32_t type)
129{
130 struct drm_mode_object *obj = NULL;
131
132 mutex_lock(&dev->mode_config.idr_mutex);
133 obj = idr_find(&dev->mode_config.crtc_idr, id);
134 if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
135 obj = NULL;
136 if (obj && obj->id != id)
137 obj = NULL;
138
139 if (obj && drm_mode_object_lease_required(obj->type) &&
140 !_drm_lease_held(file_priv, obj->id))
141 obj = NULL;
142
143 if (obj && obj->free_cb) {
144 if (!kref_get_unless_zero(&obj->refcount))
145 obj = NULL;
146 }
147 mutex_unlock(&dev->mode_config.idr_mutex);
148
149 return obj;
150}
151
152/**
153 * drm_mode_object_find - look up a drm object with static lifetime
154 * @dev: drm device
155 * @file_priv: drm file
156 * @id: id of the mode object
157 * @type: type of the mode object
158 *
159 * This function is used to look up a modeset object. It will acquire a
160 * reference for reference counted objects. This reference must be dropped again
161 * by callind drm_mode_object_put().
162 */
163struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
164 struct drm_file *file_priv,
165 uint32_t id, uint32_t type)
166{
167 struct drm_mode_object *obj = NULL;
168
169 obj = __drm_mode_object_find(dev, file_priv, id, type);
170 return obj;
171}
172EXPORT_SYMBOL(drm_mode_object_find);
173
174/**
175 * drm_mode_object_put - release a mode object reference
176 * @obj: DRM mode object
177 *
178 * This function decrements the object's refcount if it is a refcounted modeset
179 * object. It is a no-op on any other object. This is used to drop references
180 * acquired with drm_mode_object_get().
181 */
182void drm_mode_object_put(struct drm_mode_object *obj)
183{
184 if (obj->free_cb) {
185 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
186 kref_put(&obj->refcount, obj->free_cb);
187 }
188}
189EXPORT_SYMBOL(drm_mode_object_put);
190
191/**
192 * drm_mode_object_get - acquire a mode object reference
193 * @obj: DRM mode object
194 *
195 * This function increments the object's refcount if it is a refcounted modeset
196 * object. It is a no-op on any other object. References should be dropped again
197 * by calling drm_mode_object_put().
198 */
199void drm_mode_object_get(struct drm_mode_object *obj)
200{
201 if (obj->free_cb) {
202 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
203 kref_get(&obj->refcount);
204 }
205}
206EXPORT_SYMBOL(drm_mode_object_get);
207
208/**
209 * drm_object_attach_property - attach a property to a modeset object
210 * @obj: drm modeset object
211 * @property: property to attach
212 * @init_val: initial value of the property
213 *
214 * This attaches the given property to the modeset object with the given initial
215 * value. Currently this function cannot fail since the properties are stored in
216 * a statically sized array.
217 */
218void drm_object_attach_property(struct drm_mode_object *obj,
219 struct drm_property *property,
220 uint64_t init_val)
221{
222 int count = obj->properties->count;
223
224 if (count == DRM_OBJECT_MAX_PROPERTY) {
225 WARN(1, "Failed to attach object property (type: 0x%x). Please "
226 "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
227 "you see this message on the same object type.\n",
228 obj->type);
229 return;
230 }
231
232 obj->properties->properties[count] = property;
233 obj->properties->values[count] = init_val;
234 obj->properties->count++;
235}
236EXPORT_SYMBOL(drm_object_attach_property);
237
238/**
239 * drm_object_property_set_value - set the value of a property
240 * @obj: drm mode object to set property value for
241 * @property: property to set
242 * @val: value the property should be set to
243 *
244 * This function sets a given property on a given object. This function only
245 * changes the software state of the property, it does not call into the
246 * driver's ->set_property callback.
247 *
248 * Note that atomic drivers should not have any need to call this, the core will
249 * ensure consistency of values reported back to userspace through the
250 * appropriate ->atomic_get_property callback. Only legacy drivers should call
251 * this function to update the tracked value (after clamping and other
252 * restrictions have been applied).
253 *
254 * Returns:
255 * Zero on success, error code on failure.
256 */
257int drm_object_property_set_value(struct drm_mode_object *obj,
258 struct drm_property *property, uint64_t val)
259{
260 int i;
261
262 WARN_ON(drm_drv_uses_atomic_modeset(property->dev) &&
263 !(property->flags & DRM_MODE_PROP_IMMUTABLE));
264
265 for (i = 0; i < obj->properties->count; i++) {
266 if (obj->properties->properties[i] == property) {
267 obj->properties->values[i] = val;
268 return 0;
269 }
270 }
271
272 return -EINVAL;
273}
274EXPORT_SYMBOL(drm_object_property_set_value);
275
276static int __drm_object_property_get_value(struct drm_mode_object *obj,
277 struct drm_property *property,
278 uint64_t *val)
279{
280 int i;
281
282 /* read-only properties bypass atomic mechanism and still store
283 * their value in obj->properties->values[].. mostly to avoid
284 * having to deal w/ EDID and similar props in atomic paths:
285 */
286 if (drm_drv_uses_atomic_modeset(property->dev) &&
287 !(property->flags & DRM_MODE_PROP_IMMUTABLE))
288 return drm_atomic_get_property(obj, property, val);
289
290 for (i = 0; i < obj->properties->count; i++) {
291 if (obj->properties->properties[i] == property) {
292 *val = obj->properties->values[i];
293 return 0;
294 }
295
296 }
297
298 return -EINVAL;
299}
300
301/**
302 * drm_object_property_get_value - retrieve the value of a property
303 * @obj: drm mode object to get property value from
304 * @property: property to retrieve
305 * @val: storage for the property value
306 *
307 * This function retrieves the softare state of the given property for the given
308 * property. Since there is no driver callback to retrieve the current property
309 * value this might be out of sync with the hardware, depending upon the driver
310 * and property.
311 *
312 * Atomic drivers should never call this function directly, the core will read
313 * out property values through the various ->atomic_get_property callbacks.
314 *
315 * Returns:
316 * Zero on success, error code on failure.
317 */
318int drm_object_property_get_value(struct drm_mode_object *obj,
319 struct drm_property *property, uint64_t *val)
320{
321 WARN_ON(drm_drv_uses_atomic_modeset(property->dev));
322
323 return __drm_object_property_get_value(obj, property, val);
324}
325EXPORT_SYMBOL(drm_object_property_get_value);
326
327/* helper for getconnector and getproperties ioctls */
328int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
329 uint32_t __user *prop_ptr,
330 uint64_t __user *prop_values,
331 uint32_t *arg_count_props)
332{
333 int i, ret, count;
334
335 for (i = 0, count = 0; i < obj->properties->count; i++) {
336 struct drm_property *prop = obj->properties->properties[i];
337 uint64_t val;
338
339 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
340 continue;
341
342 if (*arg_count_props > count) {
343 ret = __drm_object_property_get_value(obj, prop, &val);
344 if (ret)
345 return ret;
346
347 if (put_user(prop->base.id, prop_ptr + count))
348 return -EFAULT;
349
350 if (put_user(val, prop_values + count))
351 return -EFAULT;
352 }
353
354 count++;
355 }
356 *arg_count_props = count;
357
358 return 0;
359}
360
361/**
362 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
363 * @dev: DRM device
364 * @data: ioctl data
365 * @file_priv: DRM file info
366 *
367 * This function retrieves the current value for an object's property. Compared
368 * to the connector specific ioctl this one is extended to also work on crtc and
369 * plane objects.
370 *
371 * Called by the user via ioctl.
372 *
373 * Returns:
374 * Zero on success, negative errno on failure.
375 */
376int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
377 struct drm_file *file_priv)
378{
379 struct drm_mode_obj_get_properties *arg = data;
380 struct drm_mode_object *obj;
381 int ret = 0;
382
383 if (!drm_core_check_feature(dev, DRIVER_MODESET))
384 return -EINVAL;
385
386 drm_modeset_lock_all(dev);
387
388 obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
389 if (!obj) {
390 ret = -ENOENT;
391 goto out;
392 }
393 if (!obj->properties) {
394 ret = -EINVAL;
395 goto out_unref;
396 }
397
398 ret = drm_mode_object_get_properties(obj, file_priv->atomic,
399 (uint32_t __user *)(unsigned long)(arg->props_ptr),
400 (uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
401 &arg->count_props);
402
403out_unref:
404 drm_mode_object_put(obj);
405out:
406 drm_modeset_unlock_all(dev);
407 return ret;
408}
409
410struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
411 uint32_t prop_id)
412{
413 int i;
414
415 for (i = 0; i < obj->properties->count; i++)
416 if (obj->properties->properties[i]->base.id == prop_id)
417 return obj->properties->properties[i];
418
419 return NULL;
420}
421
422static int set_property_legacy(struct drm_mode_object *obj,
423 struct drm_property *prop,
424 uint64_t prop_value)
425{
426 struct drm_device *dev = prop->dev;
427 struct drm_mode_object *ref;
428 int ret = -EINVAL;
429
430 if (!drm_property_change_valid_get(prop, prop_value, &ref))
431 return -EINVAL;
432
433 drm_modeset_lock_all(dev);
434 switch (obj->type) {
435 case DRM_MODE_OBJECT_CONNECTOR:
436 ret = drm_mode_connector_set_obj_prop(obj, prop,
437 prop_value);
438 break;
439 case DRM_MODE_OBJECT_CRTC:
440 ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value);
441 break;
442 case DRM_MODE_OBJECT_PLANE:
443 ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj),
444 prop, prop_value);
445 break;
446 }
447 drm_property_change_valid_put(prop, ref);
448 drm_modeset_unlock_all(dev);
449
450 return ret;
451}
452
453static int set_property_atomic(struct drm_mode_object *obj,
454 struct drm_property *prop,
455 uint64_t prop_value)
456{
457 struct drm_device *dev = prop->dev;
458 struct drm_atomic_state *state;
459 struct drm_modeset_acquire_ctx ctx;
460 int ret;
461
462 drm_modeset_acquire_init(&ctx, 0);
463
464 state = drm_atomic_state_alloc(dev);
465 if (!state)
466 return -ENOMEM;
467 state->acquire_ctx = &ctx;
468retry:
469 if (prop == state->dev->mode_config.dpms_property) {
470 if (obj->type != DRM_MODE_OBJECT_CONNECTOR) {
471 ret = -EINVAL;
472 goto out;
473 }
474
475 ret = drm_atomic_connector_commit_dpms(state,
476 obj_to_connector(obj),
477 prop_value);
478 } else {
479 ret = drm_atomic_set_property(state, obj, prop, prop_value);
480 if (ret)
481 goto out;
482 ret = drm_atomic_commit(state);
483 }
484out:
485 if (ret == -EDEADLK) {
486 drm_atomic_state_clear(state);
487 drm_modeset_backoff(&ctx);
488 goto retry;
489 }
490
491 drm_atomic_state_put(state);
492
493 drm_modeset_drop_locks(&ctx);
494 drm_modeset_acquire_fini(&ctx);
495
496 return ret;
497}
498
499int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
500 struct drm_file *file_priv)
501{
502 struct drm_mode_obj_set_property *arg = data;
503 struct drm_mode_object *arg_obj;
504 struct drm_property *property;
505 int ret = -EINVAL;
506
507 if (!drm_core_check_feature(dev, DRIVER_MODESET))
508 return -EINVAL;
509
510 arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
511 if (!arg_obj)
512 return -ENOENT;
513
514 if (!arg_obj->properties)
515 goto out_unref;
516
517 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
518 if (!property)
519 goto out_unref;
520
521 if (drm_drv_uses_atomic_modeset(property->dev))
522 ret = set_property_atomic(arg_obj, property, arg->value);
523 else
524 ret = set_property_legacy(arg_obj, property, arg->value);
525
526out_unref:
527 drm_mode_object_put(arg_obj);
528 return ret;
529}
1/*
2 * Copyright (c) 2016 Intel Corporation
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23#include <linux/export.h>
24#include <linux/uaccess.h>
25
26#include <drm/drm_atomic.h>
27#include <drm/drm_drv.h>
28#include <drm/drm_device.h>
29#include <drm/drm_file.h>
30#include <drm/drm_mode_object.h>
31#include <drm/drm_print.h>
32
33#include "drm_crtc_internal.h"
34
35/*
36 * Internal function to assign a slot in the object idr and optionally
37 * register the object into the idr.
38 */
39int __drm_mode_object_add(struct drm_device *dev, struct drm_mode_object *obj,
40 uint32_t obj_type, bool register_obj,
41 void (*obj_free_cb)(struct kref *kref))
42{
43 int ret;
44
45 WARN_ON(!dev->driver->load && dev->registered && !obj_free_cb);
46
47 mutex_lock(&dev->mode_config.idr_mutex);
48 ret = idr_alloc(&dev->mode_config.object_idr, register_obj ? obj : NULL,
49 1, 0, GFP_KERNEL);
50 if (ret >= 0) {
51 /*
52 * Set up the object linking under the protection of the idr
53 * lock so that other users can't see inconsistent state.
54 */
55 obj->id = ret;
56 obj->type = obj_type;
57 if (obj_free_cb) {
58 obj->free_cb = obj_free_cb;
59 kref_init(&obj->refcount);
60 }
61 }
62 mutex_unlock(&dev->mode_config.idr_mutex);
63
64 return ret < 0 ? ret : 0;
65}
66
67/**
68 * drm_mode_object_add - allocate a new modeset identifier
69 * @dev: DRM device
70 * @obj: object pointer, used to generate unique ID
71 * @obj_type: object type
72 *
73 * Create a unique identifier based on @ptr in @dev's identifier space. Used
74 * for tracking modes, CRTCs and connectors.
75 *
76 * Returns:
77 * Zero on success, error code on failure.
78 */
79int drm_mode_object_add(struct drm_device *dev,
80 struct drm_mode_object *obj, uint32_t obj_type)
81{
82 return __drm_mode_object_add(dev, obj, obj_type, true, NULL);
83}
84
85void drm_mode_object_register(struct drm_device *dev,
86 struct drm_mode_object *obj)
87{
88 mutex_lock(&dev->mode_config.idr_mutex);
89 idr_replace(&dev->mode_config.object_idr, obj, obj->id);
90 mutex_unlock(&dev->mode_config.idr_mutex);
91}
92
93/**
94 * drm_mode_object_unregister - free a modeset identifier
95 * @dev: DRM device
96 * @object: object to free
97 *
98 * Free @id from @dev's unique identifier pool.
99 * This function can be called multiple times, and guards against
100 * multiple removals.
101 * These modeset identifiers are _not_ reference counted. Hence don't use this
102 * for reference counted modeset objects like framebuffers.
103 */
104void drm_mode_object_unregister(struct drm_device *dev,
105 struct drm_mode_object *object)
106{
107 WARN_ON(!dev->driver->load && dev->registered && !object->free_cb);
108
109 mutex_lock(&dev->mode_config.idr_mutex);
110 if (object->id) {
111 idr_remove(&dev->mode_config.object_idr, object->id);
112 object->id = 0;
113 }
114 mutex_unlock(&dev->mode_config.idr_mutex);
115}
116
117/**
118 * drm_mode_object_lease_required - check types which must be leased to be used
119 * @type: type of object
120 *
121 * Returns whether the provided type of drm_mode_object must
122 * be owned or leased to be used by a process.
123 */
124bool drm_mode_object_lease_required(uint32_t type)
125{
126 switch(type) {
127 case DRM_MODE_OBJECT_CRTC:
128 case DRM_MODE_OBJECT_CONNECTOR:
129 case DRM_MODE_OBJECT_PLANE:
130 return true;
131 default:
132 return false;
133 }
134}
135
136struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
137 struct drm_file *file_priv,
138 uint32_t id, uint32_t type)
139{
140 struct drm_mode_object *obj = NULL;
141
142 mutex_lock(&dev->mode_config.idr_mutex);
143 obj = idr_find(&dev->mode_config.object_idr, id);
144 if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
145 obj = NULL;
146 if (obj && obj->id != id)
147 obj = NULL;
148
149 if (obj && drm_mode_object_lease_required(obj->type) &&
150 !_drm_lease_held(file_priv, obj->id)) {
151 drm_dbg_kms(dev, "[OBJECT:%d] not included in lease", id);
152 obj = NULL;
153 }
154
155 if (obj && obj->free_cb) {
156 if (!kref_get_unless_zero(&obj->refcount))
157 obj = NULL;
158 }
159 mutex_unlock(&dev->mode_config.idr_mutex);
160
161 return obj;
162}
163
164/**
165 * drm_mode_object_find - look up a drm object with static lifetime
166 * @dev: drm device
167 * @file_priv: drm file
168 * @id: id of the mode object
169 * @type: type of the mode object
170 *
171 * This function is used to look up a modeset object. It will acquire a
172 * reference for reference counted objects. This reference must be dropped again
173 * by callind drm_mode_object_put().
174 */
175struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
176 struct drm_file *file_priv,
177 uint32_t id, uint32_t type)
178{
179 struct drm_mode_object *obj = NULL;
180
181 obj = __drm_mode_object_find(dev, file_priv, id, type);
182 return obj;
183}
184EXPORT_SYMBOL(drm_mode_object_find);
185
186/**
187 * drm_mode_object_put - release a mode object reference
188 * @obj: DRM mode object
189 *
190 * This function decrements the object's refcount if it is a refcounted modeset
191 * object. It is a no-op on any other object. This is used to drop references
192 * acquired with drm_mode_object_get().
193 */
194void drm_mode_object_put(struct drm_mode_object *obj)
195{
196 if (obj->free_cb) {
197 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
198 kref_put(&obj->refcount, obj->free_cb);
199 }
200}
201EXPORT_SYMBOL(drm_mode_object_put);
202
203/**
204 * drm_mode_object_get - acquire a mode object reference
205 * @obj: DRM mode object
206 *
207 * This function increments the object's refcount if it is a refcounted modeset
208 * object. It is a no-op on any other object. References should be dropped again
209 * by calling drm_mode_object_put().
210 */
211void drm_mode_object_get(struct drm_mode_object *obj)
212{
213 if (obj->free_cb) {
214 DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
215 kref_get(&obj->refcount);
216 }
217}
218EXPORT_SYMBOL(drm_mode_object_get);
219
220/**
221 * drm_object_attach_property - attach a property to a modeset object
222 * @obj: drm modeset object
223 * @property: property to attach
224 * @init_val: initial value of the property
225 *
226 * This attaches the given property to the modeset object with the given initial
227 * value. Currently this function cannot fail since the properties are stored in
228 * a statically sized array.
229 *
230 * Note that all properties must be attached before the object itself is
231 * registered and accessible from userspace.
232 */
233void drm_object_attach_property(struct drm_mode_object *obj,
234 struct drm_property *property,
235 uint64_t init_val)
236{
237 int count = obj->properties->count;
238 struct drm_device *dev = property->dev;
239
240
241 if (obj->type == DRM_MODE_OBJECT_CONNECTOR) {
242 struct drm_connector *connector = obj_to_connector(obj);
243
244 WARN_ON(!dev->driver->load &&
245 connector->registration_state == DRM_CONNECTOR_REGISTERED);
246 } else {
247 WARN_ON(!dev->driver->load && dev->registered);
248 }
249
250 if (count == DRM_OBJECT_MAX_PROPERTY) {
251 WARN(1, "Failed to attach object property (type: 0x%x). Please "
252 "increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
253 "you see this message on the same object type.\n",
254 obj->type);
255 return;
256 }
257
258 obj->properties->properties[count] = property;
259 obj->properties->values[count] = init_val;
260 obj->properties->count++;
261}
262EXPORT_SYMBOL(drm_object_attach_property);
263
264/**
265 * drm_object_property_set_value - set the value of a property
266 * @obj: drm mode object to set property value for
267 * @property: property to set
268 * @val: value the property should be set to
269 *
270 * This function sets a given property on a given object. This function only
271 * changes the software state of the property, it does not call into the
272 * driver's ->set_property callback.
273 *
274 * Note that atomic drivers should not have any need to call this, the core will
275 * ensure consistency of values reported back to userspace through the
276 * appropriate ->atomic_get_property callback. Only legacy drivers should call
277 * this function to update the tracked value (after clamping and other
278 * restrictions have been applied).
279 *
280 * Returns:
281 * Zero on success, error code on failure.
282 */
283int drm_object_property_set_value(struct drm_mode_object *obj,
284 struct drm_property *property, uint64_t val)
285{
286 int i;
287
288 WARN_ON(drm_drv_uses_atomic_modeset(property->dev) &&
289 !(property->flags & DRM_MODE_PROP_IMMUTABLE));
290
291 for (i = 0; i < obj->properties->count; i++) {
292 if (obj->properties->properties[i] == property) {
293 obj->properties->values[i] = val;
294 return 0;
295 }
296 }
297
298 return -EINVAL;
299}
300EXPORT_SYMBOL(drm_object_property_set_value);
301
302static int __drm_object_property_get_prop_value(struct drm_mode_object *obj,
303 struct drm_property *property,
304 uint64_t *val)
305{
306 int i;
307
308 for (i = 0; i < obj->properties->count; i++) {
309 if (obj->properties->properties[i] == property) {
310 *val = obj->properties->values[i];
311 return 0;
312 }
313 }
314
315 return -EINVAL;
316}
317
318static int __drm_object_property_get_value(struct drm_mode_object *obj,
319 struct drm_property *property,
320 uint64_t *val)
321{
322
323 /* read-only properties bypass atomic mechanism and still store
324 * their value in obj->properties->values[].. mostly to avoid
325 * having to deal w/ EDID and similar props in atomic paths:
326 */
327 if (drm_drv_uses_atomic_modeset(property->dev) &&
328 !(property->flags & DRM_MODE_PROP_IMMUTABLE))
329 return drm_atomic_get_property(obj, property, val);
330
331 return __drm_object_property_get_prop_value(obj, property, val);
332}
333
334/**
335 * drm_object_property_get_value - retrieve the value of a property
336 * @obj: drm mode object to get property value from
337 * @property: property to retrieve
338 * @val: storage for the property value
339 *
340 * This function retrieves the softare state of the given property for the given
341 * property. Since there is no driver callback to retrieve the current property
342 * value this might be out of sync with the hardware, depending upon the driver
343 * and property.
344 *
345 * Atomic drivers should never call this function directly, the core will read
346 * out property values through the various ->atomic_get_property callbacks.
347 *
348 * Returns:
349 * Zero on success, error code on failure.
350 */
351int drm_object_property_get_value(struct drm_mode_object *obj,
352 struct drm_property *property, uint64_t *val)
353{
354 WARN_ON(drm_drv_uses_atomic_modeset(property->dev));
355
356 return __drm_object_property_get_value(obj, property, val);
357}
358EXPORT_SYMBOL(drm_object_property_get_value);
359
360/**
361 * drm_object_property_get_default_value - retrieve the default value of a
362 * property when in atomic mode.
363 * @obj: drm mode object to get property value from
364 * @property: property to retrieve
365 * @val: storage for the property value
366 *
367 * This function retrieves the default state of the given property as passed in
368 * to drm_object_attach_property
369 *
370 * Only atomic drivers should call this function directly, as for non-atomic
371 * drivers it will return the current value.
372 *
373 * Returns:
374 * Zero on success, error code on failure.
375 */
376int drm_object_property_get_default_value(struct drm_mode_object *obj,
377 struct drm_property *property,
378 uint64_t *val)
379{
380 WARN_ON(!drm_drv_uses_atomic_modeset(property->dev));
381
382 return __drm_object_property_get_prop_value(obj, property, val);
383}
384EXPORT_SYMBOL(drm_object_property_get_default_value);
385
386/* helper for getconnector and getproperties ioctls */
387int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
388 uint32_t __user *prop_ptr,
389 uint64_t __user *prop_values,
390 uint32_t *arg_count_props)
391{
392 int i, ret, count;
393
394 for (i = 0, count = 0; i < obj->properties->count; i++) {
395 struct drm_property *prop = obj->properties->properties[i];
396 uint64_t val;
397
398 if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
399 continue;
400
401 if (*arg_count_props > count) {
402 ret = __drm_object_property_get_value(obj, prop, &val);
403 if (ret)
404 return ret;
405
406 if (put_user(prop->base.id, prop_ptr + count))
407 return -EFAULT;
408
409 if (put_user(val, prop_values + count))
410 return -EFAULT;
411 }
412
413 count++;
414 }
415 *arg_count_props = count;
416
417 return 0;
418}
419
420/**
421 * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
422 * @dev: DRM device
423 * @data: ioctl data
424 * @file_priv: DRM file info
425 *
426 * This function retrieves the current value for an object's property. Compared
427 * to the connector specific ioctl this one is extended to also work on crtc and
428 * plane objects.
429 *
430 * Called by the user via ioctl.
431 *
432 * Returns:
433 * Zero on success, negative errno on failure.
434 */
435int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
436 struct drm_file *file_priv)
437{
438 struct drm_mode_obj_get_properties *arg = data;
439 struct drm_mode_object *obj;
440 struct drm_modeset_acquire_ctx ctx;
441 int ret = 0;
442
443 if (!drm_core_check_feature(dev, DRIVER_MODESET))
444 return -EOPNOTSUPP;
445
446 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
447
448 obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
449 if (!obj) {
450 ret = -ENOENT;
451 goto out;
452 }
453 if (!obj->properties) {
454 ret = -EINVAL;
455 goto out_unref;
456 }
457
458 ret = drm_mode_object_get_properties(obj, file_priv->atomic,
459 (uint32_t __user *)(unsigned long)(arg->props_ptr),
460 (uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
461 &arg->count_props);
462
463out_unref:
464 drm_mode_object_put(obj);
465out:
466 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
467 return ret;
468}
469
470struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,
471 uint32_t prop_id)
472{
473 int i;
474
475 for (i = 0; i < obj->properties->count; i++)
476 if (obj->properties->properties[i]->base.id == prop_id)
477 return obj->properties->properties[i];
478
479 return NULL;
480}
481
482static int set_property_legacy(struct drm_mode_object *obj,
483 struct drm_property *prop,
484 uint64_t prop_value)
485{
486 struct drm_device *dev = prop->dev;
487 struct drm_mode_object *ref;
488 struct drm_modeset_acquire_ctx ctx;
489 int ret = -EINVAL;
490
491 if (!drm_property_change_valid_get(prop, prop_value, &ref))
492 return -EINVAL;
493
494 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
495 switch (obj->type) {
496 case DRM_MODE_OBJECT_CONNECTOR:
497 ret = drm_connector_set_obj_prop(obj, prop, prop_value);
498 break;
499 case DRM_MODE_OBJECT_CRTC:
500 ret = drm_mode_crtc_set_obj_prop(obj, prop, prop_value);
501 break;
502 case DRM_MODE_OBJECT_PLANE:
503 ret = drm_mode_plane_set_obj_prop(obj_to_plane(obj),
504 prop, prop_value);
505 break;
506 }
507 drm_property_change_valid_put(prop, ref);
508 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
509
510 return ret;
511}
512
513static int set_property_atomic(struct drm_mode_object *obj,
514 struct drm_file *file_priv,
515 struct drm_property *prop,
516 uint64_t prop_value)
517{
518 struct drm_device *dev = prop->dev;
519 struct drm_atomic_state *state;
520 struct drm_modeset_acquire_ctx ctx;
521 int ret;
522
523 state = drm_atomic_state_alloc(dev);
524 if (!state)
525 return -ENOMEM;
526
527 drm_modeset_acquire_init(&ctx, 0);
528 state->acquire_ctx = &ctx;
529
530retry:
531 if (prop == state->dev->mode_config.dpms_property) {
532 if (obj->type != DRM_MODE_OBJECT_CONNECTOR) {
533 ret = -EINVAL;
534 goto out;
535 }
536
537 ret = drm_atomic_connector_commit_dpms(state,
538 obj_to_connector(obj),
539 prop_value);
540 } else {
541 ret = drm_atomic_set_property(state, file_priv, obj, prop, prop_value, false);
542 if (ret)
543 goto out;
544 ret = drm_atomic_commit(state);
545 }
546out:
547 if (ret == -EDEADLK) {
548 drm_atomic_state_clear(state);
549 drm_modeset_backoff(&ctx);
550 goto retry;
551 }
552
553 drm_atomic_state_put(state);
554
555 drm_modeset_drop_locks(&ctx);
556 drm_modeset_acquire_fini(&ctx);
557
558 return ret;
559}
560
561int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
562 struct drm_file *file_priv)
563{
564 struct drm_mode_obj_set_property *arg = data;
565 struct drm_mode_object *arg_obj;
566 struct drm_property *property;
567 int ret = -EINVAL;
568
569 if (!drm_core_check_feature(dev, DRIVER_MODESET))
570 return -EOPNOTSUPP;
571
572 arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
573 if (!arg_obj)
574 return -ENOENT;
575
576 if (!arg_obj->properties)
577 goto out_unref;
578
579 property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
580 if (!property)
581 goto out_unref;
582
583 if (drm_drv_uses_atomic_modeset(property->dev))
584 ret = set_property_atomic(arg_obj, file_priv, property, arg->value);
585 else
586 ret = set_property_legacy(arg_obj, property, arg->value);
587
588out_unref:
589 drm_mode_object_put(arg_obj);
590 return ret;
591}